Miami International exec surrenders 16K shares

MIAMI INTERNATIONAL HOLDINGS, INC.

Available on EDGAR 09/11/2026 - 04:23 PM EDT Accepted by SEC EDGAR 09/11/2026 - 04:23 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) reported that executive Shelly Brown, EVP and Chief Strategy Officer, had 16,283 shares of Common Stock surrendered on September 11, 2026 to the company to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock awards. This tax-withholding disposition does not represent an open-market sale, and Brown continues to hold 337,707 shares directly after the transaction. No Rule 10b5-1 trading plan is reported for this filing.

Insider Trade Summary

Tax Withholding: 16,283 shares

Tax Withholding 1 txn

Insider Brown Shelly

Role EVP, Chief Strategy Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	16,283	$42.54	$693K

Holdings After Transaction: Common Stock — 337,707 shares (Direct)

Holdings Before and After: Common Stock, 353,990 to 337,707 shares (Direct)

Footnotes (1)

1. F1. Represents shares that have been surrendered to the Company to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock awards and does not represent a sale by the reporting person.

Key Figures

Shares surrendered for taxes: 16,283 shares Transaction price per share: $42.54 per share Shares held after transaction: 337,707 shares +1 more

4 metrics

Shares surrendered for taxes 16,283 shares Common Stock surrendered on September 11, 2026 to satisfy tax withholding and remittance obligations

Transaction price per share $42.54 per share Value used for the tax-withholding disposition of 16,283 shares

Shares held after transaction 337,707 shares Directly owned MIAX Common Stock following the September 11, 2026 disposition

Tax-withholding disposition shares 16,283 shares Shares delivered or withheld for tax withholding and remittance obligations tied to restricted stock awards

Key Terms

restricted stock awards, net settlement, tax withholding and remittance obligations

3 terms

restricted stock awards financial

"in connection with the net settlement of restricted stock awards and does not"

Restricted stock awards are company shares given to employees or executives that cannot be sold or transferred until certain conditions — like staying with the company for a set time or meeting performance targets — are met, like a gift that is locked in a safe until rules are satisfied. Investors care because these awards tie management’s pay to company performance, can increase the number of shares outstanding when they become tradable (dilution), and may signal expected future selling pressure or commitment to long-term growth.

net settlement financial

"obligations in connection with the net settlement of restricted stock awards"

tax withholding and remittance obligations financial

"to satisfy tax withholding and remittance obligations in connection with the"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did MIAX executive Shelly Brown report on this Form 4?

Shelly Brown reported that 16,283 MIAX common shares were surrendered on September 11, 2026 to cover tax withholding and remittance obligations related to the net settlement of restricted stock awards. The filing states this does not represent a sale by the reporting person.

Did Shelly Brown sell MIAX stock in the open market?

No. The footnote explains the 16,283 shares were surrendered to MIAMI INTERNATIONAL HOLDINGS, INC. to satisfy tax withholding and remittance obligations from restricted stock awards and "does not represent a sale" by Shelly Brown.

How many MIAX shares does Shelly Brown hold after this transaction?

After the tax-withholding disposition, Shelly Brown directly holds 337,707 shares of MIAX common stock, as reported in the Form 4 in the "shares beneficially owned following reported transaction" field.

What was the reported price per MIAX share in this Form 4 transaction?

The Form 4 lists a transaction price of $42.54 per share for the 16,283 surrendered shares of MIAX common stock, used in connection with satisfying tax withholding and remittance obligations on restricted stock awards.

Was a Rule 10b5-1 trading plan used for Shelly Brown’s MIAX share transaction?

No. The filing’s Rule 10b5-1 checkbox is not marked as being pursuant to a plan, and no footnote describes the transaction as made under a Rule 10b5-1 trading plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Brown Shelly

(Last) (First) (Middle)

C/O MIAMI INTERNATIONAL HOLDINGS, INC.

7 ROSZEL ROAD, SUITE 1A

(Street)

PRINCETON NEW JERSEY 08540

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
MIAMI INTERNATIONAL HOLDINGS, INC. [ MIAX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Chief Strategy Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/11/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/11/2026		F(1)		16,283	D	$42.54	337,707	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares that have been surrendered to the Company to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock awards and does not represent a sale by the reporting person.

Remarks:

	/s/Alessandra Maria Corona Henriques, Attorney-in-Fact	09/11/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)